Post on 04-Mar-2020
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Department of Physics
University of Arizona
Theoretical particle physicsat the LHC Era
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Welcome!I am Shufang Su.
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What’s hot in particle physics today?
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• Fundamental interactions – Gravity– Electromagnetic force– Weak interaction burning of the sun …– Strong interaction holds proton and neutron …
• Building blocks of matter -- elementary particles
smaller distance : higher energy
Particles and Forces
forces
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Standard Model of Particle Physics -
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Standard Model of Particle Physics -
Strong interactions
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Standard Model of Particle Physics -
Strong interactions
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Standard Model of Particle Physics -
Strong interactions
Origin of mass
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Standard Model of Particle Physics -
Strong interactions
Origin of mass
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Standard Model of Particle Physics -
Strong interactions
Origin of mass
Unification+gravity
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Standard Model of Particle Physics -
Strong interactions
Origin of mass
Unification+gravity
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LEP (-2000)
e-e+
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LEP (-2000)
e-e+
Tevatron (now)
p
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LEP (-2000)
e-e+
Tevatron (now)
p
LHC (2008)
p p
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LEP (-2000)
e-e+
Tevatron (now)
p
LCLHC (2008)
p p
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LEP (-2000)
e-e+
Tevatron (now)
p
LC
We live in an exciting era when rich data is / will become available
LHC (2008)
p p
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Group
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Group Members -
• Faculty:
ZackariaChacko
KeithDienes
InaSarcevic
ShufangSu
DougToussaint
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Group Members -
• Postdocs (for Dienes, Su and Toussaint)
Current:
Alexei Bazavov (2007) FSU → UA
Brooks Thomas (2007) Michigan → UA
Previous:
Dru Renner (2004-2007) MIT → UA → DESY
Hock-Seng Goh (2004-2007) Maryland → UA → Berkeley
Sabine Hossenfelder (2003-2005) Germany → UA → Santa Barbara
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SkyBaumanDienes
Ethan DolleSu
Mike LennekDienes(2007)
Vaibhav WasnikDienes
Steve BildsteinToussaint
(2005)
Menika SharmaDienes
• Students (for Dienes, Su and Toussaint)
Walter FreemanToussaint
XinyuMiaoSu
Baran Nosratpour
Chacko
Chris KrenkeChacko
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SkyBaumanDienes
Ethan DolleSu
Mike LennekDienes(2007)
Vaibhav WasnikDienes
Steve BildsteinToussaint
(2005)
Menika SharmaDienes
• Students (for Dienes, Su and Toussaint)
Walter FreemanToussaint
XinyuMiaoSu
Baran Nosratpour
Chacko
Chris KrenkeChacko
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Close research connections to other groups-
• Nuclear physics
• Heavy Ion
• Experimental high energy
Barrett, Fleming, van Kolck
Rutherfoord, Shupe, Johns, Cheu, Varnes
Rafelski, Thews
• Theoretical astrophysics group Fang, Melia, Ozel, Psaltis
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Research
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Energytheo
rPh
eno
Model-analyzers
Model-builders
LHC Physics
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Energy
10-3 GeV
theo
rPh
eno
Model-analyzers
Model-builders
LHC Physics
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Energy
10-3 GeV
theo
rPh
eno
Toussaint
Model-analyzers
Model-builders
LHC Physics
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Energy
10-3 GeV 103 GeV
q l
g h…
theo
rPh
eno
Toussaint
Model-analyzers
Model-builders
LHC Physics
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Energy
10-3 GeV 103 GeV
q l
g h…
theo
rPh
eno
Toussaint
Su
Model-analyzers
Model-builders
LHC Physics
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Energy
10-3 GeV 103 GeV
q l
g h…
theo
rPh
eno
Toussaint
Su
Chacko
Model-analyzers
Model-builders
LHC Physics
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Energy
10-3 GeV 103 GeV
q l
g h…
theo
rPh
eno
Toussaint
Su
Chacko
1019 GeV
Model-analyzers
Model-builders
LHC Physics
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Energy
10-3 GeV 103 GeV
q l
g h…
theo
rPh
eno
Toussaint
Su
Chacko
1019 GeV
Model-analyzers
Model-builders
Dienes
LHC Physics
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Lattice QCD at U. of A. -D. Toussaint
Calculations including dynamical quarks
Lattice QCD at Arizona
Calculations including dynamical quarks
The MILC Collaboration
14 physicists, 9 institutions
at Arizona: Doug Toussaint,
Alexei Bazavov, Walter Free-
man
Light hadron spectrum, pseu-
doscalar meson physics (quark
masses), topological suscepti-
bility and vacuum structure,
high temperature QCD phase
transition and equation of
state,
The MILC Collaboration14 Physicists, 9 institutionsat Arizona: Doug Toussaint, Alexei Bazavov, Walter Freeman
The Fermilab/MILC Collaborationadd the Fermilab group
The HotQCD CollaborationHigh temperature QCD, using the Livermore machines
The USQCD Collaboration“Collaboration of collaborations” - hardware and software for lattice work
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1. Demonstrate control of QCD calculations by calculating known things
2. Calculate matrix elements needed to find standard model parameters for experiments
3. or maybe beyond the standard model?
4. Understand the workings of QCD (confinement)
5. Hadronic phenomenology, for example low energy constants in chiral perturbation theory
6. Development of techniques for better simulations
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Lattice QCD can now compute some things with accuracy of a few percent.
Ratios of lattice results to experimental values for “gold plated” things.
Lattice QCD can now
compute some things
with accuracy of a few
percent.
Ratios of lattice re-
sults to experimental
values for “gold plated”
things.
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Electroweak Physics at U. of A -
• Standard Model: a successful model • Many open questions requires new physics beyond the SM
Z. Chacko, S. Su
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Electroweak Physics at U. of A -
• Standard Model: a successful model • Many open questions requires new physics beyond the SM
Z. Chacko, S. Su
We work on physics beyond the SM that could potentially be discovered in the current and upcoming experiments.
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Electroweak Physics at U. of A -
• Supersymmetry: boson ⇔ fermion, extension of Lorentz symmetry
• Extra dimension: D > 4?
• Grand unification: weak, strong and electromagnetic forces ⇒ a single grand unifying force?
• Neutrino physics: origin of neutrino masses?
• Cosmology: past history / future of the universe?
• Modification of Einstein gravity: modifications possible? experimental constraints?
Z. Chacko
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Electroweak Physics at U. of A -
S. Su Working on similar stuff as Chacko. However, focus on
Theory Experiments
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Electroweak Physics at U. of A -
S. Su Working on similar stuff as Chacko. However, focus on
Theory Experiments
Particle physics
Astrophysics
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Electroweak Physics at U. of A -
S. Su Working on similar stuff as Chacko. However, focus on
Theory Experiments
Particle physics
Astrophysics
Dark matter, dark energyCMB, BBN Baryongenesis…
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String Phenomenology at U. of A -K. Dienes
String Phenomenology
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String Phenomenology at U. of A -K. Dienes
String Phenomenology
• the “interplay” or “meeting-ground” between Planck-scale physics and TeV-scale physics• the “art” of using the new insights from string theory in order to understand, explain, and predict what physics at next energy scale is going to look like
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String Phenomenology at U. of A -K. Dienes
String Phenomenology
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String Phenomenology at U. of A -K. Dienes
String Phenomenology
Standard Model • choice of gauge group• number of generations• masses• mixings, etc …
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String Phenomenology at U. of A -K. Dienes
String Phenomenology
Standard Model • choice of gauge group• number of generations• masses• mixings, etc …
Extensions to SM: • SUSY• GUT’s• hidden sectors• technicolor…
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String Phenomenology at U. of A -K. Dienes
String Phenomenology
Standard Model • choice of gauge group• number of generations• masses• mixings, etc …
Formal Issues: • string vacuum selection• non-pert. dynamics• string duality• new mathematical structure …
Extensions to SM: • SUSY• GUT’s• hidden sectors• technicolor…
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String Phenomenology at U. of A -K. Dienes
String Phenomenology
Standard Model • choice of gauge group• number of generations• masses• mixings, etc …
Formal Issues: • string vacuum selection• non-pert. dynamics• string duality• new mathematical structure …
String Cosmology: • role of dilaton• effects of light d.o.f.’s• extra dimensions• CC problem …
Extensions to SM: • SUSY• GUT’s• hidden sectors• technicolor…
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Research related Activities
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Research related Activities -
• Seminars, colloquiua and Visitors • Group meetings
− journal club (with nuclear theory group)− brown bag lunch (with nuclear theory group)− discussion group on dark energy and early universe (with theoretical astrophysics group and astronomy dept.)
• Summer schools and conferences− lecture at summer schools, etc. − plenary talks at conferences/workshops− organize conferences/workshops SUSY03, LATTICE06, “Rethinking Gravity”, string landscape workshop ...
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Urgent Need
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Urgent Need
Replacement of Chacko !
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• LHC (2008): golden era for particle physics • Theoretical particle physics: critical
- what to expect ? - How to interpret ?
LHC Era
LHC (2008)
p p
For Arizona to maintain its influence and impact in the overall LHC enterprise
↓a strong HEP theory group!
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Energy10-3 GeV 103 GeV
theo
rPh
eno
Toussaint
Su
Chacko
1019 GeV
Model-analyzers
Model-builders
Dienes
LHC Physics
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Energy10-3 GeV 103 GeV
theo
rPh
eno
Toussaint
Su
Chacko
1019 GeV
Model-analyzers
Model-builders
Dienes
LHC Physics
Sarcevic
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Energy10-3 GeV 103 GeV
theo
rPh
eno
Toussaint
Su
Chacko
1019 GeV
Model-analyzers
Model-builders
Dienes
LHC Physics
HEP theory group has been highly successful by any measure of excellence!
Sarcevic
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Energy10-3 GeV 103 GeV
theo
rPh
eno
Toussaint
Su
1019 GeV
Model-analyzers
Model-builders
Dienes
LHC Physics
HEP theory group has been highly successful by any measure of excellence!
Sarcevic
LHC-energy model builder
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This can not wait!
• Imminent turn on of LHC (finally!)• Remain competitive with other universities• Danger of “further external raid”, “melt-down” of HEP theory group• Minimal start-up, immense payoff• Sustain current grant support• Aggressive, “smart” hiring over past decade• Department-wide agreement: top priority
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This can not wait!
• Imminent turn on of LHC (finally!)• Remain competitive with other universities• Danger of “further external raid”, “melt-down” of HEP theory group• Minimal start-up, immense payoff• Sustain current grant support• Aggressive, “smart” hiring over past decade• Department-wide agreement: top priority
Need to move aggressively right now.
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Thanks!